Statement $A$: Hydrogen is a fuel of energy.
Statement $R$: Photosynthetic microorganisms produce $H_2$,which are capable of converting solar energy into chemical energy.

  • A
    $A$ and $R$ are both true. $R$ is not the correct explanation of $A$.
  • B
    $A$ and $R$ are both true. $R$ is the correct explanation of $A$.
  • C
    $A$ and $R$ are both false.
  • D
    $A$ is true. $R$ is false.

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Which one of the following is an incorrect match of a microbe and its industrial product,while the other three are correct?

Which of the following is not used for the disinfection of drinking water?

Which microorganisms are useful for obtaining energy sources?

Select the correct statement.

Select the odd one out.

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